WO1994007101A1 - Radiant heating furnace - Google Patents
Radiant heating furnace Download PDFInfo
- Publication number
- WO1994007101A1 WO1994007101A1 PCT/GB1993/001902 GB9301902W WO9407101A1 WO 1994007101 A1 WO1994007101 A1 WO 1994007101A1 GB 9301902 W GB9301902 W GB 9301902W WO 9407101 A1 WO9407101 A1 WO 9407101A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- furnace
- reflector
- heating element
- furnace according
- lamps
- Prior art date
Links
- 238000010438 heat treatment Methods 0.000 title claims abstract description 29
- 230000000712 assembly Effects 0.000 claims description 16
- 238000000429 assembly Methods 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 7
- 239000010453 quartz Substances 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 7
- 229910052736 halogen Inorganic materials 0.000 claims description 6
- 150000002367 halogens Chemical class 0.000 claims description 6
- 239000012141 concentrate Substances 0.000 claims description 2
- 239000002826 coolant Substances 0.000 claims description 2
- 239000012530 fluid Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 230000000694 effects Effects 0.000 description 3
- 239000004411 aluminium Substances 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B17/00—Furnaces of a kind not covered by any preceding group
- F27B17/02—Furnaces of a kind not covered by any preceding group specially designed for laboratory use
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B13/00—Single-crystal growth by zone-melting; Refining by zone-melting
- C30B13/16—Heating of the molten zone
- C30B13/22—Heating of the molten zone by irradiation or electric discharge
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B3/00—Ohmic-resistance heating
- H05B3/0033—Heating devices using lamps
- H05B3/0038—Heating devices using lamps for industrial applications
Definitions
- This invention relates to furnaces, and particularly to furnaces of the type adapted to focus a large amount of radiant energy over a small area, such as a narrow elongated specimen.
- quartz halogen lamps and particularly, linear quartz halogen lamps, in housings with suitably shaped reflectors, to provide an intense heating effect over a small area.
- heaters employing such techniques are the models 5215 and 5193 "line heaters" of Research Inc. of Minneapolis Minnesota 55424 USA.
- a first aspect of the present invention provides a furnace comprising a body which is split into at least two parts which are movably mounted so that they can be brought together to enclose a specimen to be heated, each part including at least one substantially linear radiant heat source, so that the sample can be heated uniformly, at least on two opposite sides.
- substantially linear radiant heat source it is intended that the heat source comprises one or more radiant heating elements, which are so arranged in reflector housings as to provide an elongate region which is substantially uniformly heated.
- the heat source comprises a heating element assembly including a plurality of lamps such as quartz halogen lamps, which are powered so as to emit a substantial part of their energy in the infra-red region, and which are arranged along the inside of a generally elongate, bowl shaped reflector, whose internal surface is shaped so as to compensate for the distribution of-the heat source elements.
- lamps such as quartz halogen lamps, which are powered so as to emit a substantial part of their energy in the infra-red region, and which are arranged along the inside of a generally elongate, bowl shaped reflector, whose internal surface is shaped so as to compensate for the distribution of-the heat source elements.
- a single "linear" lamp may be used, in which case the elongate bowl shaped reflector is specially curved at each end, to compensate for the less even distribution of energy in that region of the lamp.
- the furnace comprises two halves which are pivotally mounted on support means so that they can be pivoted into engagement to enclose an article to be heated, each half carrying a pair of adjustably mounted heating element assemblies which are directed towards the centre of the furnace, the heating element assemblies being so arranged, relative to one another, that when the furnace is enclosed around the article they substantially surround it.
- each heating element assembly preferably occupies one quadrant of a lateral cross section through the furnace, relative to the heating axis, and is provided with a slidable mounting which allows its position to be adjusted at least in a radial direction, and preferably also in a circumferential direction relative to the axis.
- the heating element assemblies are so shaped and arranged that they cooperate to substantially enclose the article being heated when the furnace is closed, and concentrate the radiant heat output at an adjustable focus in the central region.
- the ends of the "bowl shape” are deeply curved in a "re ⁇ entrant” shape, so as to compensate for the "fall-off” in output at each end of the linear array of lamps, and so that the maximum concentration of heat occurs at or near the outer opening of the reflector.
- each heating element assembly comprises a metal body which is machined to form the required reflector shape and also to form internal channels for the circulation of fluid coolant.
- the heating element assemblies are formed in this way, they nay be arranged to substantially enclose the specimen being heated so that a separate cooling jacket is not required.
- Figure 1 is a diagrammatic cross-section through a part of a furnace body in accordance with the invention, taken on the line A-A of Figure 2;
- Figure 2 is a diagrammatic front view of the furnace body of Figure 1;
- Figure 3a is an axial cross-section through a first type of reflector
- Figure 3b shows a first type of lamp used as a heat source
- Figure 3c shows an array of three lamps used as a heat source
- Figure 3d illustrates a possible alternative arrangement of three lamps
- Figure 4a is a diagrammatic side elevation of a second type of furnace according to the invention.
- Figure 4b is a side elevation of the furnace of Figure 4a;
- Figure 5a is a top plan view of a third type of furnace in accordance with the invention.
- Figure 5b is a side elevation of the furnace of Figure 5a;
- - Figure 6a is an end tiew of a reflector and lamp mounting assembly
- Figure 6b is a side elevation of the assembly of Figure 6a;
- Figure 6c is a lateral cross-section through the lamp and reflector assembly of Figures 6a and 6b, taken on the line B-B of Figure 6d;
- Figure 6d is a top plan view of the lamp and reflector assembly of Figures 6a and 6b;
- Figure 7 is a schematic view of a power circuit suitable for use with a furnace having lamp and reflector assemblies of the kind shown in Figure 6.
- the furnace illustrated comprises a body in two halves, which are substantially "mirror images" of one another, each half comprising a pair of lamp and reflector assemblies 2, 4, which fit together so that the reflectors 6 of each half face towards one another when the two halves are assembled together.
- the operative "centre” of the furnace is in the region to the right of this figure, and it is surrounded by a square “water jacket” 8, through which water is pumped while the furnace is operational in order to prevent heat from escaping into the surroundings.
- Each reflector assembly is pivoted about a transverse axis 10, near its front end, so that the angle of incidence of the radiant heat on the article to be heated, can be adjusted.
- the reflector assembly is slidable along its axis, as indicated by the arrow X, so that the distance from the lamp to the heated article, can also be adjusted.
- Wing nuts 12, Figure 2 enable the reflector assemblies to be fixed in their adjusted positions.
- An air cooled window assembly 14 is also arranged between the two reflector assemblies 2, 4 with a viewing telescope 16 mounted between them, on an adjustable mounting, so that the article under test can be observed.
- Figure 3a illustrates a "elongate bowl shape" reflector profile, designed to produce a uniform heat output, and which may be used with a lamp of the linear "double ended" type as shown in Figure 3b, or, in slightly more refined configuration, with a multiple lamp array as illustrated in Figure 3c or Figure 3d.
- a lamp of the linear "double ended" type as shown in Figure 3b
- a multiple lamp array as illustrated in Figure 3c or Figure 3d.
- FIGs 4a and 4b illustrate the arrangement of a furnace assembly particularly intended to utilise heat source arrangements of this kind.
- the basic arrangement of the furnace body is similar to that of Figure 1, and includes two body "halves" 20, which can be brought together to enclose the article to be heated, each of which carries a pair of reflector assemblies 22, which are so mounted that the four reflector assemblies completely surround the article to be heated, each being arranged at 90° to the two adjacent assemblies.
- each end of each reflector assembly is also pivo ally and slidably mounted in a radially extending slot so that the distance between each heating element and the article being heated, as well as the angle of the incident heating beam, can be adjusted, to suit objects of different shapes and sizes.
- Figures 5a and 5b illustrate an arrangement which is generally similar, but in which the reflector units are mounted vertically, when the article being heated needs to be arranged in a vertical orientation for testing purposes (e.g. to assess the "creep" characteristics of the material) .
- the four reflector units 30 are mounted with their axes vertical (so that the ends are seen in Figure 5a, which is a plan view) , and mate closely together around the sample.
- a slot 32 may be provided between the adjacent edges of two of the reflectors, to allow for making extensometry measurements.
- Figure 6a to 6d illustrate the arrangement of a preferred type of reflector unit constructed in accordance with the invention.
- the reflector unit shown has been milled from a rectangular block of aluminium (using a "CAOCAM” machine) so as to form a rather complex "boat shaped" cut out 36, whose axial plane of symmetry coincides with the diagonal plane 38 through the aluminium block.
- the cut out has a "re-entrant" shape, so that the ends 40 of the opening 42 of the reflector, overhang the ends of the interior of the reflector.
- the external shape of the reflector body is such that it is particularly adapted to the type of arrangement indicated in Figure 4a or 5a in which the article being heated is substantially enclosed by the reflector bodies.
- a lamp base housing 44 connected to the back of the reflector body houses three "single ended" quartz halogen lamps 46, 48, and 50, and the curvature of the internal surface of the reflector is such that the distribution of radiation at the mouth of the reflector is substantially linear, between the two ends 40 of the opening.
- water cooling channel 52 are drilled through the parts of the block forming the sides of the reflector, parallel to its longitudinal axis, and these channels are interconnected by manifolds 54 at each end of the body. In this way the necessity for a separate water cooling jacket may be avoided.
- a quartz window 100 may be provided to cover the front aperture of the reflector.
- FIG. 7 illustrates a typical control circuit for the furnace apparatus.
- the interior of the furnace 60 is monitored by a temperature sensor 62 suitably positioned to detect the heat output of the three quartz halogen lamps 46, 48, 50.
- a water flow sensor 64 is arranged to detect the flow of water through the cooling channels 52 through the body of each reflector assembly.
- the output from the two sensors is supplied to a PID controller 66, which produces control signals on the line 68 for respective thyristors 70, 72 and 74 powering the three lamps at a suitable voltage to maximise their output in the IR region.
- a power supply 76 (which may be single or three- phase) supplies power via a line 78 to the controller and associated alarms, which are triggered if the temperature moves outside a specified range, or if the water supply is interrupted (for example) and also supplies power to the thyristors, via respective li iters 80, 82 and 84.
- heating "zones" may be provided by incorporating more lamps and associated control circuitry.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- General Engineering & Computer Science (AREA)
- Clinical Laboratory Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Mechanical Engineering (AREA)
- Control Of Resistance Heating (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
- Control And Other Processes For Unpacking Of Materials (AREA)
- Meat, Egg Or Seafood Products (AREA)
- Investigating Or Analyzing Materials Using Thermal Means (AREA)
- Devices For Use In Laboratory Experiments (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE0659263T DE659263T1 (en) | 1992-09-11 | 1993-09-09 | RADIANT HEATER. |
EP94910242A EP0659263A1 (en) | 1992-09-11 | 1993-09-09 | Radiant heating furnace |
AU49769/93A AU672041B2 (en) | 1992-09-11 | 1993-09-09 | Radiant heating furnace |
JP6507882A JPH08506411A (en) | 1992-09-11 | 1993-09-09 | Radiant heating furnace |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9219221.0 | 1992-09-11 | ||
GB929219221A GB9219221D0 (en) | 1992-09-11 | 1992-09-11 | Furnace |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1994007101A1 true WO1994007101A1 (en) | 1994-03-31 |
Family
ID=10721743
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1993/001902 WO1994007101A1 (en) | 1992-09-11 | 1993-09-09 | Radiant heating furnace |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0659263A1 (en) |
JP (1) | JPH08506411A (en) |
AU (1) | AU672041B2 (en) |
DE (1) | DE659263T1 (en) |
GB (1) | GB9219221D0 (en) |
WO (1) | WO1994007101A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1923163A2 (en) * | 2006-11-17 | 2008-05-21 | General Electric Company | Lamp-based SWET welding apparatus |
DE112004001402B4 (en) * | 2003-07-28 | 2011-07-28 | Mattson Technology Inc., Calif. | Apparatus for thermally treating a substrate |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2559249A (en) * | 1948-02-18 | 1951-07-03 | William H Hudson | Infrared oven structure |
US3353005A (en) * | 1965-07-06 | 1967-11-14 | Aerojet General Co | Brazing furnace |
US3683154A (en) * | 1970-11-16 | 1972-08-08 | Dorothy M Kapperman | Temperature control device |
US3763348A (en) * | 1972-01-05 | 1973-10-02 | Argus Eng Co | Apparatus and method for uniform illumination of a surface |
US4159411A (en) * | 1976-09-13 | 1979-06-26 | Ellersick Russell R | Portable radiant heating apparatus |
EP0133847A2 (en) * | 1983-08-11 | 1985-03-06 | Tri Innovations AB | A reflector structure for infrared radiation ovens |
-
1992
- 1992-09-11 GB GB929219221A patent/GB9219221D0/en active Pending
-
1993
- 1993-09-09 AU AU49769/93A patent/AU672041B2/en not_active Ceased
- 1993-09-09 JP JP6507882A patent/JPH08506411A/en active Pending
- 1993-09-09 WO PCT/GB1993/001902 patent/WO1994007101A1/en not_active Application Discontinuation
- 1993-09-09 EP EP94910242A patent/EP0659263A1/en not_active Ceased
- 1993-09-09 DE DE0659263T patent/DE659263T1/en active Pending
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2559249A (en) * | 1948-02-18 | 1951-07-03 | William H Hudson | Infrared oven structure |
US3353005A (en) * | 1965-07-06 | 1967-11-14 | Aerojet General Co | Brazing furnace |
US3683154A (en) * | 1970-11-16 | 1972-08-08 | Dorothy M Kapperman | Temperature control device |
US3763348A (en) * | 1972-01-05 | 1973-10-02 | Argus Eng Co | Apparatus and method for uniform illumination of a surface |
US4159411A (en) * | 1976-09-13 | 1979-06-26 | Ellersick Russell R | Portable radiant heating apparatus |
EP0133847A2 (en) * | 1983-08-11 | 1985-03-06 | Tri Innovations AB | A reflector structure for infrared radiation ovens |
Non-Patent Citations (1)
Title |
---|
Derwent's abstract, No 91-139 421/19, week 9119, ABSTRACT OF SU 15 900 893, (DBUKO V I), 1990-09-07 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE112004001402B4 (en) * | 2003-07-28 | 2011-07-28 | Mattson Technology Inc., Calif. | Apparatus for thermally treating a substrate |
EP1923163A2 (en) * | 2006-11-17 | 2008-05-21 | General Electric Company | Lamp-based SWET welding apparatus |
EP1923163A3 (en) * | 2006-11-17 | 2009-12-02 | General Electric Company | Lamp-based SWET welding apparatus |
Also Published As
Publication number | Publication date |
---|---|
EP0659263A1 (en) | 1995-06-28 |
JPH08506411A (en) | 1996-07-09 |
AU4976993A (en) | 1994-04-12 |
DE659263T1 (en) | 1996-01-04 |
GB9219221D0 (en) | 1992-10-28 |
AU672041B2 (en) | 1996-09-19 |
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